CN104852876B - A kind of aviation wireless burst communication system - Google Patents
A kind of aviation wireless burst communication system Download PDFInfo
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- CN104852876B CN104852876B CN201510253105.2A CN201510253105A CN104852876B CN 104852876 B CN104852876 B CN 104852876B CN 201510253105 A CN201510253105 A CN 201510253105A CN 104852876 B CN104852876 B CN 104852876B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
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Abstract
A kind of aviation wireless burst communication system of the present invention, module is built comprising burst frame, receive digital front-end processing module, burst detector, carrier wave, phase parameter extraction and recovery module and timing parameters extraction and recovery module.Burst frame structure module is used to build burst frame, burst frame by AGC training sequences, the multiple CAZAC training sequences of two identicals, data chunk into.Digital front-end processing module is received to be used to obtain the initial demodulation signal with frequency deviation, skew and timing error；Burst detector is used to carry out matched filtering to initial demodulation signal using multiple CAZAC training sequences, obtains burst and indicates and export two correlation peaks and relevant peaks side lobe levels；Carrier wave, phase parameter extraction and recovery module are used to estimate carrier wave, phase parameter and complete to recover；Timing parameters extract and recovery module completion timing is recovered.The present invention can effectively improve the detection probability of burst frame, while reduce the complexity of burst communication carrier wave, phase and Timed Recovery.
Description
Technical field
The invention belongs to wireless communication technology field, be one kind be related to aviation wireless communication burst signal detection, timing and
The implementation method of carrier synchronization parameter Estimation.
Background technology
Burst communication system is the wireless communication system for launching information with the short period, because signal is in transmitting procedure
Open-assembly time is shorter, effectively reduces the probability that signal of communication is scouted, intercepted and captured, so as to improve the anti-interference energy of communication system
Power.The characteristics of burst communication, determines in this kind of system to be difficult to realize carrier synchronization and Timing Synchronization by feedback control loop, dashes forward
Hair communication receiver, which will demodulate information, must first carry out burst signal detection, detect that signal is timed, carried again after arriving
Wave parameter is estimated and recovered, and completes the operation such as demodulating and decoding afterwards, recovers originating data.
Burst communication system generally use is based on data-aided burst signal detection method, mainly there is following several sides
Method：1st, frequency domain detection method.Reception signal is transformed into frequency domain, calculates the characteristic spectrum range value of assistance data, then with setting
Thresholding compares, and being judged to signal more than thresholding reaches.How many sampling point of this method participates in calculating the FFT that will calculate how many point,
Operand is bigger, and decision threshold can change with signal level.2nd, power detection method.Calculate the power of reception signal
And relatively made decisions with the thresholding of setting.The advantages of this method is that thresholding setting is insensitive to carrier wave frequency deviation, but thresholding
Relevant with signal amplitude, the dynamic range of signal is limited.3rd, matching matrix.This method is sensitive to carrier wave frequency deviation, it is necessary to dynamic
State is adjudicated, the bad setting of thresholding.
The content of the invention
The invention aims to solve the deficiencies in the prior art, it is proposed that a kind of aviation wireless burst communication system,
By the use of double multiple CAZAC training sequences as training sequence, burst detection, the program are carried out by a kind of new bimodal detection scheme
It is insensitive to the amplitude and signal to noise ratio of reception signal, while carrier wave, phase and timing can be carried out using two correlation peaks and is joined
Number estimation.This method can effectively improve the detection probability of burst frame, while it is extensive to reduce burst communication carrier wave, phase and timing
Multiple complexity.
The content of the invention of the present invention is achieved through the following technical solutions：
A kind of aviation wireless burst communication system, module is built comprising the burst frame positioned at transmitting terminal, positioned at receiving terminal
Receive digital front-end processing module, burst detector, carrier wave, phase parameter extraction and recovery module and timing parameters extraction and
Recovery module；
The burst frame structure module is used to encode information source and burst frame structure, and passes through symbol mapping and front end
Processing, completes the burst transmissions to information；The burst frame by AGC training sequences, the multiple CAZAC training sequences of two identicals,
Data chunk is into the spacing of two multiple CAZAC training sequences is D symbol, and D is positive integer；
The digital front-end processing module that receives is used to carry out initial down coversion to the ADC input signals for carrying out bandpass sampling
And filtering, obtain the initial demodulation signal with frequency deviation, skew and timing error；And initial demodulation signal feeding buffer is entered
Row caching；
The burst detector is used to carry out matched filtering to initial demodulation signal using multiple CAZAC training sequences, if preceding
Latter two correlation peak then provides burst mark more than thresholding and exports two correlation peaks and relevant peaks side lobe levels；
The carrier wave, phase parameter extraction and recovery module are used to be carried using two relevant peaks and relevant peaks side lobe levels
Wave error parameter, phase error parameter Estimation, and indicate the original position of the burst determined in a buffer according to burst
Carrier wave, phase recovery are completed to initial demodulation signal；
The timing parameters extraction and recovery module are used to be timed mistake using two relevant peaks and relevant peaks side lobe levels
Poor parameter Estimation, to having completed the data completion timing recovery of carrier wave, phase recovery, and deliver to subsequent decoding module recovery letter
Breath.
Preferably, the buffer uses circular buffer, and buffer depth is more than 1 bursty data and always counted.
Preferably, the burst detector by two correlation peaks before thresholding is carried out relatively, first to matching degree highest
The data of data segment carry out energy normalizing where two correlation peaks.
Preferably, the number of the relevant peaks side lobe levels of the burst detector output is each two of the left and right of relevant peaks.
Preferably, the carrier wave, phase parameter extraction and recovery module pass through institute during the thresholding for crossing burst detector is right
First correlation peak and second correlation peak answered carry out difference, obtain carrier error parameter；By with first correlation
Then phase value corresponding to peak obtains digital NCO phase values as initial phase value with the initial phase value and carrier error parameter；
Carrier phase recovery is carried out to data in buffer with digital NCO phase values.
Preferably, the timing parameters extraction and recovery module obtain timing error parameter by following formula：
Wherein M counts for FFT, and k is over-sampling rate, and q is to specify frequency, and N trails for sequence.
Preferably, the timing parameters extraction and recovery module carry out resampling using cubic interpolation device, described to insert three times
Value device is shown below：
Preferably, aviation wireless burst communication system is by changing former and later two identical spacing for answering CAZAC training sequences
D, realize and spectrum estimation scope and precision are quickly adjusted.
The present invention has following several technical essentials：
1st, transmitting terminal completes burst frame structure using double multiple CAZAC training sequences as synchronizing sequence.Pass through double CAZAC sequences
Row detection reduces burst signal detection false-alarm probability；
2nd, to passing through first down coversion and filtered data, completed using matched filter real-time with multiple CAZAC sequences
Correlation, the inspection of burst due in is completed by a kind of burst detector of new double training sequences based on energy normalizing
Survey；
3rd, the burst due in obtained according to burst detector, obtain matched filter obtain with it is double multiple
The correlation peak R of CAZAC training sequences1And R (0)2(0)；And extract former and later two correlations R of correlation peak1(- 2), R1(-
1), R1(1), R1And R (2)2(- 2), R2(- 1), R2(1), R2(2)；Carrier wave, phase are completed using correlation and its side lobe levels and are determined
When parameter extraction, reduce burst communication system carrier timing parameter extraction difficulty.
Beneficial effects of the present invention are:
1st, using CAZAC sequences as training sequence, its good autocorrelation performance ensure that burst detection and synchronism
Energy；Employ a kind of new burst detection scheme, to it is traditional using fixed threshold as detection threshold in a manner of improved,
Detected value is used for using relevant peaks modulus value and performance number, the program has the characteristic insensitive to signal intensity and SNR；
3rd, carrier wave and phase directly can be obtained by former and later two correlation peaks as training sequence using double CAZAC sequences
Information, and according to the left and right secondary lobe completion timing control information extraction of correlation peak, realize simple；
3rd, excellent performance is realized, this programme detection performance is excellent, and parameter Estimation is simple, suitable for burst communication system.Adopt
With the OQPSK burst communication systems actual measurement error performance detected based on this burst communication signals as shown in Figure 9, Figure 10, it is seen that adopt
With the inventive method excellent performance, there is good error performance.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of aviation wireless burst communication system of the present invention；
Fig. 2 is the structural representation of burst frame in the present invention；
Fig. 3 is the structural representation of burst detector in the present invention；
The output result of burst detector when Fig. 4 is varying input signal amplitude in embodiment；
The output result of burst detector when Fig. 5 is different SNR in embodiment；
Fig. 6 is the detection performance schematic diagram of burst detector in the present invention；
Fig. 7 is the carrier phase recovery performance schematic diagram of carrier wave in the present invention, phase parameter extraction and recovery module；
Fig. 8 is that the timing parameters of timing parameters extraction and recovery module estimate performance schematic diagram in the present invention；
Fig. 9 is present invention actual measurement error performance schematic diagram under awgn channel；
Figure 10 is invention actual measurement error performance schematic diagram under Rician channels.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, the difference of a kind of aviation wireless burst communication system of the present invention and continuous communiction system is
Burst frame structure, burst signal detection, timing subcarriers parameter Estimation and recovery.The invention mainly comprises the burst positioned at transmitting terminal
Frame builds module, is extracted positioned at the reception digital front-end processing module of receiving terminal, burst detector, carrier wave, phase parameter and extensive
Multiple module and timing parameters extraction and recovery module.By being encoded to information source and burst frame is built, and reflected by symbol
Penetrate and front-end processing, complete the burst transmissions to information；The ADC input signals for carrying out bandpass sampling are carried out initial down coversion and
Filtering, obtain the initial demodulation signal with frequency deviation, skew and timing error；Initial demodulation signal is cached, and with answering
CAZAC training sequences carry out matched filtering, and burst detection is completed using burst detector, provide burst and indicate and obtain two phases
Close peak value and relevant peaks side lobe levels；Parameter Estimation is carried out using relevant peaks and its side lobe levels, carrier wave, phase and timing is obtained and joins
Number；Indicate the original position of determination burst in the buffer by happening suddenly, complete carrier wave, phase and Timed Recovery, carry out
Demodulation result is arrived in judgement, and delivers to subsequent decoding module and can recover information.
Modules are elaborated below.
(1) burst frame is built
Reference picture 2, give the burst frame structure of the present invention.As described in Figure, burst frame of the invention trains sequence by AGC
Row, the multiple CAZAC training sequences of two symbols of identical 32, data chunk into.Wherein AGC training sequences are used for burst transmissions work(
Rate is stable, and the sequence length can be determined according to real system；Double multiple CAZAC training sequences are used for burst arrival detection and carried
Ripple/phase/timing parameters extraction, the spacing of two multiple CAZAC training sequences is D symbol, and D values will influence carrier estimation model
Enclose, can be according to system requirements flexible design；Data block is used to fill business information.Burst frame structure link corresponds in Fig. 1
Burst structure module.
(2) digital front-end processing module is received
For carrying out digital front-end processing to the signal received, mainly by Digital Down Convert, filtering etc., final output 4
Times over-sampling matched filtering output.The output result, which also has carrier wave/phase residual error, to be needed to calibrate, and there is also timing error needs
Recover.
Because using the frame structure that happens suddenly as described in Figure 2, burst number could be judged by only receiving second CAZAC complex sequences
According to arrival, it is therefore desirable to enter row buffering to bursty data.Bursty data buffer uses circular buffer, buffer in the present invention
Depth is always counted slightly larger than 1 bursty data, and to ensure to continue in the completed before processing, the current frame data that happen suddenly are uncovered.
(3) burst detector
Burst detector employed in the present invention as described in Figure 3, wherein into burst detector data be by number
2 times of character rate over-sampling data after word front-end processing.(because burst detector only needs 2 times of over-samplings, and before numeral
End output for 4 times of over-sampling rates, therefore the information for entering burst detector extracted for 4 times of over-sampling rate data dot interlaces after number
According to.)
If transmission signal is s (t), if by awgn channel, reception signal passes through down coversion and the orthogonal mixing of local carrier,
After low pass filter, obtained reception signal is：
Δ w is frequency deviation in formula, θ0For carrier wave initial phase difference, n (t) is multiple Gauss noise.Have after being sampled to above formula
Related operation is carried out to the signal r (k) and multiple CAZAC training sequences received, when reception signal and training sequence
Two relevant peaks will be produced during matching.
First relevant peaks be
Second relevant peaks be
Wherein, D spacing, R between two training sequencescs(k) it is training sequence and the correlation function for receiving data, only connects
Receive when data match with training sequence and peak value just occurs.
Happen suddenly frame structure as described in Figure 2, identical using two multiple CAZAC training sequences, two of which training sequence.With reference to
Two correlation peaks of formula can obtain
When only former and later two training sequences match in above formula,It can be just a very big reality
Number, V is noise item.When reception data match with training, correlation is equivalent to matched filtering, in order to eliminate frequency deviation phase effect,
Modulus has：
At this moment have
|R(k+D)R*(k)|≈|R0||RD|
Above formula and signal energy, can be according to two in order to avoid fixed threshold is more sensitive to amplitude and noise into positive correlation
The energy higher value of matching degree highest receiving data segment is normalized.It can be write as by the burst detector output of energy normalizing
Following formula
When above formula crosses thresholding, then it is assumed that burst arrives, and produces relevant peaks mark, at this moment records correlation R (k) and makees
For the correlation peak of reception signal and first CAZAC sequence, phases of the R (k+D) as reception signal and second CAZAC sequence
Close peak value.Meanwhile the original position of burst in buffer is determined by relevant peaks mark and exports correlation peak and correlation
Each 2 relevant peaks side lobe levels in peak or so.
Burst detector structure described in reference picture 3, the input signal of identical signal to noise ratio under different amplitudes is calculated
Machine emulates, and simulation result is as shown in Figure 4；Computer Simulation has been carried out to the signal of identical input amplitude under different signal to noise ratio, imitated
True result is as shown in the figure.From Fig. 4 and the simulation result of figure, burst detection and to input signal amplitude size and signal to noise ratio
Size is insensitive.Fig. 6 gives the detection performance of detector, it is known that the detector has very low detection threshold and excellent inspection
Survey performance.
In this module, mainly there is following feature：
Answering CAZAC training sequences due to former and later two has good autocorrelation performance, can effectively improve detection probability；
The burst detector built according to two multiple CAZAC training sequences, can effectively be dropped by the positional information between two CAZAC
Low false-alarm probability.
By the method for energy normalized, burst detector is reduced to signal amplitude and the susceptibility of signal to noise ratio, Ke Yi
Fixed threshold is used under difference input amplitude and signal to noise ratio.
(4) carrier wave, phase parameter extraction and recovery
Varied less in view of the amounts of frequency offset of the signal in a burst, it can be considered that difference is oblique caused by frequency deviation
Rate is frequency spectrum, and initial value is the straight line of first relevant peaks phase.Thus, the carrier error value obtained by estimationAnd phase valueThen digital NCO phase values are obtained by initial value of the phase value, carrier phase recovery is carried out to data in buffer area.
To be moved into one's husband's household upon marriage corresponding first correlation peak in limited time and second correlation peak progress difference in burst detector, can
Because two training sequences are using the multiple CAZAC training sequences of identical, thus move into one's husband's household upon marriage in limited time, in above formulaFor real number, ignore noise item, can thus extract carrier error estimate
Due to arg { R (k+D) R in above formula*(k) } span for (- π, π], thus the estimable relative frequency deviation of the algorithm
Scope is
Phase estimation can extract phase value corresponding to first relevant peaks, as initial phase value, the phase estimation value
It is as follows：
Carrier phase recovery numeral NCO phases generation such as following formula：
According in the data buffer zones of NCO phase recoveries shown in above formula for data, you can complete carrier wave and phase recovery.
Carrier phase recovery Computer Simulation performance is as shown in Figure 7, it is known that the carrier phase recovery scheme can directly utilize burst detection
Relevant peaks carry out parameter extraction, realize simple, excellent performance.
In this module, mainly there is following feature：
1st, fitting a straight line is carried out by the phase value of former and later two identical multiple CAZAC sequences, carries out carrier wave and phase recovery.
2nd, by changing former and later two identical multiple CAZAC sequence space Ds, spectrum estimation scope and precision can be carried out quick
Adjustment；
(5) timing parameters extraction and recovery
The modulus value of CAZAC complex correlation values has sharp correlation properties, is understood using the frequency domain time delay theorem of DFT algorithms,
Timing offset will be presented as correlation peak DFT phase error, and Timing error estimate can be obtained by following formula.
Wherein M counts for FFT, and k is over-sampling rate, and q is to specify frequency, and N trails for sequence.In the present invention, M values are
4, q values are 1, are analyzed using 5 correlations of 2 points of hangovers, wherein 5 correlations are correlation peak and its front and rear each 2 points
Relevant peaks side lobe levels, with reference to former and later two relevant peaks, common root is timed estimation error according to 10 correlations.
Timed Recovery carries out resampling using cubic interpolation device, and cubic interpolation device is shown below.
Timed Recovery Computer Simulation performance as described in Figure 8, the timing synchronization algorithm as seen from the figure based on CAZAC correlations
It is insensitive to system frequency deviation, reliable timing synchronisation information estimation can be carried out under hostile transmission environment.
In this module, it is mainly characterized in that：
The principle of frequency domain phase shift is corresponded to based on time domain time shift, by 10 after former and later two relevant peaks and its neighbouring truncation
Individual correlation carries out parameter Estimation, and carries out resampling completion timing recovery using cubic interpolation device
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (8)
1. a kind of aviation wireless burst communication system, module is built comprising the burst frame positioned at transmitting terminal, positioned at connecing for receiving terminal
Receive digital front-end processing module, burst detector, carrier wave, phase parameter extraction and recovery module and timing parameters extraction and extensive
Multiple module, it is characterised in that：
Burst frame structure module is used to encode information source and burst frame structure, and by symbol mapping and front end at
Reason, completes the burst transmissions to information；The burst frame is by automatic growth control AGC training sequences, the multiple Heng Bao of two identicals
Network zero auto-correlation CAZAC training sequences, data chunk are into the spacing of two multiple CAZAC training sequences is D symbol, and D values are
Positive integer；
The digital front-end processing module that receives is used to carry out initial down coversion and filter to the ADC input signals for carrying out bandpass sampling
Ripple, obtain the initial demodulation signal with frequency deviation, skew and timing error；And initial demodulation signal feeding buffer is delayed
Deposit；
The burst detector is used to match initial demodulation signal using multiple permanent envelope zero auto-correlation CAZAC training sequences
Filtering, burst is provided if former and later two correlation peaks exceed thresholding and indicates and exports two correlation peaks and relevant peaks secondary lobe
Value；
The carrier wave, phase parameter extraction and recovery module are used to carry out carrier wave mistake using two relevant peaks and relevant peaks side lobe levels
Poor parameter, phase error parameter Estimation, and indicate the original position of the burst determined in a buffer to first according to burst
Beginning demodulated signal completes carrier wave, phase recovery；
The timing parameters extraction and recovery module are used to be timed error ginseng using two relevant peaks and relevant peaks side lobe levels
Number estimation, to having completed the data completion timing recovery of carrier wave, phase recovery, and deliver to subsequent decoding module recovery information.
2. a kind of aviation wireless burst communication system according to claim 1, it is characterised in that the buffer uses ring
Shape buffer, buffer depth are always counted more than 1 block of burst data.
3. a kind of aviation wireless burst communication system according to claim 1, it is characterised in that the burst detector exists
Before two correlation peaks are carried out into thresholding relatively, first the data of data segment where two correlation peaks of matching degree highest are carried out
Energy normalizing.
4. a kind of aviation wireless burst communication system according to claim 1, it is characterised in that the burst detector is defeated
The number of the relevant peaks side lobe levels gone out is each two of the left and right of relevant peaks.
5. a kind of aviation wireless burst communication system according to claim 1, it is characterised in that the carrier wave, phase parameter
First corresponding correlation peak and second relevant peaks when extraction and recovery module are by by the thresholding for crossing burst detector
Value carries out difference, obtains carrier error parameter；By using phase value corresponding to first relevant peaks as initial phase value, then
Numerically-controlled oscillator NCO phase values are obtained with the initial phase value and carrier error parameter；With numerically-controlled oscillator NCO phases
Value carries out carrier phase recovery to data in buffer.
A kind of 6. aviation wireless burst communication system according to claim 1, it is characterised in that the timing parameters extraction
And recovery module obtains timing error parameter by following formula：
Wherein M is FFT points, and k is over-sampling rate, and q is to specify frequency, and N is that sequence is trailed, R () represent the signal received and
Multiple permanent envelope zero auto-correlation CAZAC training sequences carry out related operation, and v span is {-N ,-(N-1) ..., N }.
A kind of 7. aviation wireless burst communication system according to claim 1, it is characterised in that the timing parameters extraction
And recovery module carries out resampling using cubic interpolation device, the cubic interpolation device is shown below：
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8. a kind of aviation wireless burst communication system according to claim 1, it is characterised in that by changing former and later two
The space D of identical multiple permanent envelope zero auto-correlation CAZAC training sequences, realizes and carries out fast velocity modulation to spectrum estimation scope and precision
It is whole.
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| CN106572037A (en) * | 2016-11-11 | 2017-04-19 | 中国航空无线电电子研究所 | Signal frame receiving method for aviation telemetering channel |
| CN106899400B (en) * | 2017-03-01 | 2020-03-24 | 北京天行健联信息技术有限责任公司 | Burst data frame sending method and device |
| CN106992831B (en) * | 2017-04-14 | 2018-08-14 | 中国航空无线电电子研究所 | A kind of communication system time synchronizer |
| CN107682294B (en) * | 2017-10-11 | 2020-10-16 | 中国电子科技集团公司第五十四研究所 | FPGA-based phase ambiguity correction method for high-speed 16apsk signal |
| CN108923886B (en) * | 2018-06-25 | 2020-07-31 | 中国科学院计算技术研究所 | Unique code type detection method |
| CN109547091B (en) * | 2018-11-27 | 2020-06-30 | 上海航天电子通讯设备研究所 | Processing system for multi-channel detection based on VDE |
| CN109919015A (en) * | 2019-01-28 | 2019-06-21 | 东南大学 | A kind of radio-frequency fingerprint extraction and recognition methods based on more sampling convolutional neural networks |
| CN110545550B (en) * | 2019-08-12 | 2023-03-10 | 北京国电通网络技术有限公司 | Synchronous detection method for burst broadband communication |
| CN111130740A (en) * | 2019-12-20 | 2020-05-08 | 成都川美新技术股份有限公司 | BGAN uplink signal receiving method and equipment during lack of signaling guidance |
| CN114337869A (en) * | 2020-09-29 | 2022-04-12 | 广州慧睿思通科技股份有限公司 | Signal resident position detection method and device, computer device and storage medium |
| CN113225286B (en) * | 2021-04-22 | 2022-03-01 | 中国电子科技集团公司第五十四研究所 | UQPSK signal demodulating device |
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| CN103227764A (en) * | 2012-12-14 | 2013-07-31 | 西安英菲泰尔电子科技有限公司 | Rapid carrier synchronization method for carrying out coherent demodulation on burst transmission signal |
| CN103873225A (en) * | 2014-03-26 | 2014-06-18 | 清华大学 | Timing estimation method for burst communication |
| CN104333525A (en) * | 2014-10-23 | 2015-02-04 | 广州海格通信集团股份有限公司 | GMSK (Gaussian minimum shift keying) modulating system synchronization method |
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| CN102332933A (en) * | 2011-09-28 | 2012-01-25 | 上海交通大学 | Short-term burst spread spectrum signal transmitting and receiving method |
| CN102801673A (en) * | 2012-08-16 | 2012-11-28 | 苏州英菲泰尔电子科技有限公司 | Quick carrier synchronizing method for FSK signal coherent demodulation |
| CN103227764A (en) * | 2012-12-14 | 2013-07-31 | 西安英菲泰尔电子科技有限公司 | Rapid carrier synchronization method for carrying out coherent demodulation on burst transmission signal |
| CN103873225A (en) * | 2014-03-26 | 2014-06-18 | 清华大学 | Timing estimation method for burst communication |
| CN104333525A (en) * | 2014-10-23 | 2015-02-04 | 广州海格通信集团股份有限公司 | GMSK (Gaussian minimum shift keying) modulating system synchronization method |
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